This portion of the Basic Network
Troubleshooting is probably the easiest and yet most easily
misunderstood. Since anyone today building their first network
will be using CAT5 or Twisted Pair
cables, (believe me it is so much easier to use than Coaxial
cable... ), this discussion is about CAT5.
But, it need not be hard... unless you
make it hard.
A basic network, two PCs joined together to
share the files on one and other, is composed of the following:
Could it be any easier?
Okay... so I am being flippant.
Most people today do not use a single cable between the two PCs.
But, let us discuss first this setup.
Cabling is usually the
first thing to suspect:
Single cable setup
When you use only a single cable to connect two PCs,
no hub or switch between them, the cable MUST be a cross-pin
or Crossed-Over cable. If you have a standard
patch cable or straight through cable, it will not work.
To understand, go to our "Cabling Issues" page to read
more: Cabling Issues
Hub (or switch) Setup
If you have a hub and both PCs are connected to it
with a separate cable, (this is seen more and more these days),
the cables must be standard patch
cables or Straight-though cables.
Not the most sure-fire way to check the Network card,
but if the small light on the back of your card is green,
typically it is functioning properly.
Just like troubleshooting any I/O, (in/out),
card, be sure the slot the card is in is functioning, you can
always switch the card to another slot on the motherboard.
Be sure that the card has been assigned an IRQ by the Bios,
preferably IRQ 10 or 11. Can the card be bad right out of
the box? But, of course.
A big issue here with any I/O card, but mostly
with Network cards is to have the proper driver. Windows
will look at cards and load drivers it believes will work...
that does not mean they will work!
If you did not receive a disk with drivers when you bought the
card, then download them from the manufacturer's web site.
If the card is too old to have drivers available or just an odd
card with no drivers... even buying a low-end card is
better than fighting this nightmare.
We recently built 20 rackmount servers with
two network cards in each computer. Out of the 40 cards we
installed, one was bad right out of the box. It does
happen... and if the card is bad, it is hard to
troubleshoot. That is why we keep extra cards around, so
we can switch out any card that does not seem to function
properly. You can pickup an extra card cheap Network card
for under $16 dollars, (in the US), to switch out a card that
does not seem to be functioning.
The best way to insure
that the hardware you are using is working is to BE CAREFUL with
it during the installation. Computer components fail most
often because of mistreatment... dropping them, banging
them and so forth. Yes, heat is a killer... so is
static electricity... but, more components are damaged by
mistreatment than anything else.
There is just not a lot more to tell you...
there is just too little that can go wrong with Network
hardware. So, be patient and if you have a problem, go
slow switching out any perceived bad parts.